JP2024004566A - Cleaner for coating film peeling agent - Google Patents

Abstract

To provide a cleaner for a coating film peeling agent which can sufficiently clean a coating apparatus and a coating machine after use of a coating film peeling agent and facilitates storage, transportation and use thereof.SOLUTION: There is provided a cleaner for a coating film peeling agent used for cleaning an apparatus which uses a coating film peeling agent for peeling the existing coating film on a wall or the like, wherein the main components of the cleaner for a coating film peeling agent are water and a hydrocarbon compound having a hydroxyl group, thereby enabling sufficiently cleaning of a coating apparatus and a coating machine after using the coating film peeling agent and facilitating storage, transportation and use of the cleaner.SELECTED DRAWING: None

Description

The present disclosure relates to a cleaner for a paint film remover that is used to remove the paint film remover that adheres to and remains on equipment such as a coating machine after using the paint film remover.

BACKGROUND ART Conventionally, the surfaces of steel structures such as bridges are often coated with anti-rust paint, and the structure is protected by the coating film made of the anti-rust paint. Painting with this anti-rust paint is performed every few years to maintain the durability of steel structures.
This type of painting may be coated over and over, but if the layered layer becomes thick, the layered layer must be removed, the steel exposed, and a rust-prevention paint applied. .

Removal of the rust-preventing paint film is performed by a physical removal method such as a scraping process using a comb or the like or a blasting process using a blast, or by a removal method using a paint film remover.
When physical removal such as scrubbing or blasting is performed, noise and dust may be generated. Therefore, the paint film may be removed using a paint film remover. This paint film stripping agent includes one such as that disclosed in Patent Document 1.

It has a pH in the range of 5 to 9, contains water, benzyl alcohol, and at least one type of cellulose derivative, and has a mass ratio of benzyl alcohol to water (mass of benzyl alcohol/mass of water) of 0. It is in the range of 6 to 4.8.
This provides a water-based paint stripping composition that reduces the risk of fire, health problems, etc. in the paint stripping work process and can exhibit stripping properties equivalent to or better than solvent-based strippers. It is.

This paint-type paint stripper composition is applied to the surface of an existing paint film, such as a paint film made of rust-preventing paint, using painting equipment or a coating machine, and swells the existing paint film to remove it. Become.
The painting equipment and spray machines used for this application are often cleaned with a flammable organic solvent such as isopropyl alcohol to remove any remaining paint stripper composition. , Cleaning is carried out using such organic solvents as cleaning agents.

WO2018/179925

However, while cleaning using such flammable organic solvents as a cleaning agent can sufficiently remove the remaining paint remover, care must be taken when handling this cleaning agent to prevent fire and ventilation. , there may be restrictions on storage space and transportation, and handling may not be easy.
An object of the present disclosure is to provide a cleaner for a paint film remover that can sufficiently clean painting equipment, a coating machine, etc. after using the paint film remover, and is easy to store, transport, and use. It is in.

A paint remover cleaner used for cleaning equipment that uses a paint remover to remove existing paint films on walls, etc. The main components of this paint remover cleaner have water and hydroxyl groups. It is a hydrocarbon compound.
This makes it possible to sufficiently clean the painting equipment, coating machine, etc. after using the paint film stripping agent, and to facilitate storage, transportation, and use.

Since the paint film stripping agent has benzyl alcohol as its main component, its compatibility with water, which is one of the main components, can be further improved, so that more thorough cleaning can be performed.

When the hydrocarbon compound is one or more selected from the group of glycols having two or more hydroxyl groups, more sufficient cleaning can be performed.

Embodiments of the present disclosure will be described.
A paint remover cleaner used for cleaning equipment that uses a paint remover to remove existing paint films on walls, etc. The main components of this paint remover cleaner have water and hydroxyl groups. It is a hydrocarbon compound.

Here, the paint film stripping agent of the present disclosure is a water-based paint film stripping agent, and is a water-based paint film stripping agent that is used to remove existing paint on vertical surfaces and ceiling surfaces of building structures such as walls on which existing paint films exist, and on steel structures such as bridges. It is used to peel off the membrane.
This existing paint film is a paint film formed on the wall surface of a building structure using paint, etc., and a typical example is a paint film formed with anti-rust paint on the surface of a steel structure. There is.

There is a method of removing the existing paint film by scraping it using a polishing machine such as a sander or a sander, but this method generates dust during peeling, so liquid paint that generates less dust is used. Wet stripping work using a film stripping agent is often performed.
There are two types of paint removers: non-aqueous ones that are mainly composed of organic solvents and water-based ones that are mainly composed of water-soluble solvents. , water-based paint strippers containing water, cellulose derivatives, etc. are increasingly being used.

This water-based paint stripper has a flash point of 93°C or higher, is difficult to catch fire, and can be made to have a certain viscosity, so it can be used on vertical surfaces and ceiling surfaces of architectural structures such as walls where existing paint films are present. Many water-based paint film removers have high viscosity and high adhesion so that many water-based paint film removers can be applied to existing paint films such as those on bridges.
Since these paint film stripping agents have high viscosity, they are often applied using a coating device such as a coating machine or a coating machine. Therefore, it may be time-consuming to clean paint machines and painting equipment that use high-viscosity paint strippers.

A cleaner for the paint film remover is needed to clean the coating machines and painting equipment that use this paint film remover. Particularly when a water-based paint remover is used, it is effective to use a paint remover cleaner whose main components are water and a hydrocarbon compound having a hydroxyl group.
This is because the paint remover cleaner can dissolve the paint remover, making it possible to easily clean the highly viscous paint remover, and remove the paint remover that has adhered to the inside of the paint sprayer. It can dissolve paint film remover adhering to paint and painting equipment, lowering its viscosity, and cleaning it.

By using this paint remover cleaner, you can thoroughly clean painting equipment and painting machines after using the paint remover, and it will be easy to store, transport, and use. Become.
This paint remover cleaner is mainly composed of water and a hydrocarbon compound with a hydroxyl group, and by using the hydrocarbon compound with a hydroxyl group, it has good compatibility with water, making it easier to use than conventional cleaners. It is possible to dissolve the paint film remover without using a low boiling point organic solvent, and to obtain a highly safe cleaner for the paint film remover.

Hydrocarbon compounds having this hydroxyl group include ethylene glycol, propylene glycol, butylene glycol, etc., which are classified as glycols.
Among these hydrocarbon compounds with hydroxyl groups, ethylene glycol and propylene glycol are preferably used, and by using them, they have a certain viscosity and can be used to clean painting equipment and painting machines that use water-based paint strippers. I can do it well.

Further, the blending ratio of the hydrocarbon compound having a hydroxyl group is preferably in the range of 25.0 to 75.0% by weight, and if it is less than 25.0% by weight, the paint film stripping agent cannot be sufficiently dissolved. First, paint stripper may remain on the painting equipment or spray machine used.
When the amount is more than 75.0% by weight, it is possible to sufficiently dissolve the paint remover attached to painting equipment and spray machines, but the drying of the equipment and machinery after cleaning becomes slow, and in some cases, Rust can quickly develop on equipment and machinery.

More preferably, the content is in the range of 40.0 to 75.0% by weight, and within this range, the paint film remover can be sufficiently dissolved, and the paint remover can be used in painting equipment, paint machines, etc. using it. Cleanability becomes good.
Further, it is preferable that the specific gravity of this cleaner for the paint film remover is in the range of 1.0 to 1.1, and the paint film remover adhering to the inside of the spray machine can be removed from the paint film remover cleaner. By passing the cleaner through it, the pressure can be used to easily clean it.

Within the above formulation, the specific gravity of the paint film remover cleaner can be easily adjusted to a range of 1.0 to 1.1.
The viscosity of this paint remover cleaner is preferably in the range of 6 to 10 seconds at 23°C, as measured using an Iwata cup (viscosity cup NK-2 manufactured by Anest Iwata). By passing the paint film remover adhering to the inside of the machine through a paint film remover cleaner, the dissolved paint film remover can be easily flushed away and the paint film remover can be thoroughly cleaned.

Further, within the above formulation, the viscosity of the paint film remover cleaner can be easily adjusted within the range without using a viscosity modifier.
This paint film remover cleaner may also contain a surfactant. Examples of the surfactant include antifoaming agents for extinguishing foam contained in paint remover cleaners and those that improve miscibility with paint removers.

Among these, antifoaming agents are often used, and by using antifoaming agents, it is possible to reduce the air contained in the paint remover cleaner, increasing the chances of it coming into contact with the paint remover, and cleaning it efficiently. Can be removed.
Additionally, if there are a lot of bubbles in the paint remover cleaner, the specific gravity of the paint remover cleaner will decrease, making it difficult to apply pressure to the paint remover cleaner, which may reduce cleaning performance. be.

How to use the paint film remover cleaner configured as described above will be explained in detail. In this usage explanation, it is a paint film remover cleaner whose main components are water and a hydrocarbon compound having a hydroxyl group, and ethylene glycol is used as the hydrocarbon compound having a hydroxyl group.
This blending ratio is 50% by weight of water and 50% by weight of ethylene glycol, its specific gravity is 1.02, and its viscosity is 8 seconds at 23°C as measured using an Iwata cup. .

This cleaner for a paint film remover was used to clean an airless coating machine used for applying a paint film remover. The paint film remover was Aqua Remover Eco manufactured by Kikusui Chemical Co., Ltd. This paint film remover was a water-based paint film remover containing benzyl alcohol as a main component and water in addition.
In addition, this paint film remover has a high viscosity and can be applied in large quantities at one time, with an average coating amount of 1.0 kg/ ^m2 and a coating thickness of 1.0 kg/m2. It was about .0 mm.

This paint film remover was applied to four vertical surfaces of a 30 cm x 30 cm steel rectangular column coated with antirust paint and left for 24 hours. Even when confirmed 24 hours later, it did not run down even on the vertical surface.
The airless atomizer used for this application was the same as that commonly used in painting work. A scraper was used for the peeling work.

The airless coating machine used for applying this paint film remover was cleaned immediately after the work of applying the paint film remover was completed.
The procedure involved removing paint stripper remaining in the airless paint sprayer's suction hose and hopper. Thereafter, a paint film remover cleaner was put into the hopper, the atomizer was started, and the atomizer was flowed through the atomizer and its suction hose, and then discharged from the outlet.

Further, the discharged cleaner for the paint film remover was again poured into the hopper to circulate the cleaner for the paint film remover. This circulation was carried out for 10 minutes, and the degree of cleaning was then checked to confirm that the cleaning was sufficient.
After the paint film removal work, the prisms from which the paint film had been removed could be cleaned, and the paint film stripping agent remaining on the prisms could be sufficiently removed. In this removal, the paint film remover was removed by impregnating a cloth with a cleaner for the paint film remover.

In comparison, when water is used instead of a paint remover cleaner, the paint remover remaining in the suction hose or hopper of the airless paint sprayer is removed, water is poured into the hopper, and water is poured into the hopper. The sprayer was operated, and the solution was poured through the sprayer and its suction hose, and then discharged from the outlet.
The water that was discharged contained particles and lumps of paint film remover that could not be dissolved and could not be thoroughly cleaned.

In addition, if cleaning is performed using only ethylene glycol, remove the paint film remover remaining in the suction hose and hopper of the airless paint sprayer as described above, put ethylene glycol into the hopper, and operate the paint sprayer. It was poured throughout the spray machine and its suction hose, and then discharged from the discharge port.
It was confirmed that the paint film remover was sufficiently dissolved in the ethylene glycol that was discharged, and that cleaning was successful.

Further, the discharged ethylene glycol in which the paint film stripper was sufficiently dissolved was poured into the hopper again and circulated. This circulation was carried out for 10 minutes, and the degree of cleaning was then checked to confirm that the cleaning was sufficient.
After cleaning, the hopper was left to dry, but compared to using a paint remover cleaner, the drying time was slower, and rust could be observed on the exposed iron parts of the hopper. Ta.

In addition, after the paint film was removed, the prisms from which the paint film had been removed were wiped with a cloth soaked in ethylene glycol, but drying was slow and progressing to the next process was delayed, resulting in even more parts being removed. Rust also occurred.
Furthermore, cleaners for paint film stripping agents containing ethylene glycol at a blending ratio of 25.0% by weight, 40.0% by weight, and 75.0% by weight were also prepared. Their specific gravity was in the range of 1.0 to 1.1, and the viscosity was in the range of 6 to 10 seconds at 23° C. as measured using an Iwata cup.

These paint remover cleaners are also used in the same way as above, remove the paint remover remaining in the suction hose or hopper of the airless paint sprayer, put the paint remover cleaner into the hopper, and start the sprayer. , flowed throughout the spray machine and its suction hose, and discharged from the discharge port.
The discharged paint film remover cleaner was poured into the hopper again to circulate the paint film remover cleaner. This circulation was carried out for 10 minutes, and the degree of cleaning was then checked to confirm that the cleaning was sufficient.

Furthermore, after the paint film removal work, the prisms from which the paint film had been removed could be cleaned, and the paint film remover remaining on the prisms could be sufficiently removed. In this removal, a waste cloth was soaked in a cleaner for the paint film remover, and the paint film remover was removed using this, and no rust formation could be confirmed.
From this result, the paint film remover can be sufficiently dissolved, and the cleaning of painting equipment and painting machines using it is good, and the cleaning of equipment, machines, and metals such as steel materials used after cleaning has been confirmed. The drying time was not extremely slow and rusting was fast and difficult to occur.

Furthermore, the paint film remover was removed using a paint film remover cleaner containing propylene glycol instead of ethylene glycol. The blending ratio was 50% by weight of water and 50% by weight of propylene glycol, and an antifoaming agent was added to suppress the foaming of the cleaner for paint film stripping agent.
Its specific gravity was 1.03, and its viscosity was 7.5 seconds at 23°C as measured using an Iwata cup.
This cleaner for a paint film remover using propylene glycol was used to clean an airless coating machine used for applying a paint film remover. The paint film remover was Aqua Remover Eco, manufactured by Kikusui Chemical Co., Ltd., as described above.

The airless paint sprayer used to apply the paint remover was also cleaned immediately after the paint remover application work was completed to remove the paint remover remaining in the suction hose and hopper of the airless paint remover. Thereafter, a paint film remover cleaner was put into the hopper, the atomizer was started, and the atomizer was flowed through the atomizer and its suction hose, and then discharged from the outlet.
The discharged paint film remover cleaner was poured into the hopper again to circulate the paint film remover cleaner. This circulation was carried out for 10 minutes, and the degree of cleaning was then checked to confirm that the cleaning was sufficient.

Furthermore, the foaming of the paint film remover cleaner after washing was less than that of the paint film remover cleaner using ethylene glycol, confirming the effect of adding an antifoaming agent.

Claims (3)

A paint film remover cleaner used for cleaning equipment using a paint film remover for peeling off existing paint films on walls, etc.
This paint film remover cleaner has water and a hydrocarbon compound having a hydroxyl group as its main components. The cleaner for a paint film remover according to claim 1, wherein the paint film remover contains benzyl alcohol as a main component. The cleaner for a paint film remover according to claim 1 or 2, wherein the hydrocarbon compound is one or more selected from the group of glycols having two or more hydroxyl groups.